layout

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No entiendo a qué se refieren exactamente con layout en este documento. Se trata de purificación del agua, aquí vael párrafo completo donde aparece tres veces y luego otro más:
Surface waters require complete purification (disinfections, sedimentation, removal of mechanical admixtures, decoloration, preliminary filtration through gravel, slow filtration through sand, disinfection). Further procedures can be carried out thief required by local conditions. The constructional arrangement of the layout is determining by the production capacity and component assembly of the projected construction, topography, and hydrogeological conditions of the site, climatic conditions, and the possibility of organizing zones of sanitary protection, backed up by technical and financial calculations. Choice of types of basic and ancillary equipment depend on the technological method of water treatment. The combination of corresponding technological processes and constructions compose a technological layout for water quality improvement. The existing technological layouts can be classified as follows:

Technological layouts can be divided into a number of technological processes with different stages in each of them (single stage process, double stage process, and multistage process).

The technological layouts are divided into free (gravity flow) and pressurized ones.